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Fusion Science and Technology
Hanford completes wastewater basin work to support tank waste treatment
Record-breaking heat and the vast size of the job did not stop the Department of Energy’s Office of River Protection and its tank operations contractor, Washington River Protection Solutions (WRPS), from completing a construction project critical to the Hanford Site’s Direct-Feed Low-Activity Waste program for treating radioactive tank waste.
S. Sumida, M. Ichimura, T. Yokoyama, M. Hirata, R. Ikezoe, Y. Iwamoto, T. Okada, K. Takeyama, S. Jang, M. Sakamoto, Y. Nakashima, M. Yoshikawa, R. Minami, K. Oki, M. Mizuguchi, K. Ichimura
Fusion Science and Technology | Volume 68 | Number 1 | July 2015 | Pages 136-141
Technical Paper | Open Magnetic Systems 2014 | dx.doi.org/10.13182/FST14-890
Articles are hosted by Taylor and Francis Online.
In the GAMMA 10 tandem mirror, divertor simulation experiments that utilize particle flux toward the west end region (called end-loss flux) have been implemented. Since a positive correlation has been reported between the end-loss flux and the central-cell density, an increase of the central-cell density is important for obtaining a higher end-loss flux on the divertor simulation experiments. By arranging the ion cyclotron range of frequency (ICRF) systems so as to excite strong ICRF waves in both anchor cells simultaneously, we have succeeded in producing high-density plasmas (line density of 1.2×1014 cm−2) in both anchor cells. As a result, a higher central-cell density of 4.4×1012 cm−3 and a higher end-loss flux of more than 1023 m−2s−1 have been obtained. One of the possible mechanisms of the high density production is a formation of positive potentials on both anchor cells. Plasmas in the central cell are confined due to those potentials.